Sash-balancing mechanism.



E. GEORGEPF.

SASH BALANGING MECHANISM.

APPLIOATIDN FILED JULY 2a. 1911` Patented Apr. 16, 1912.

W/TNESSES:

UNITED sTATEs PATENT oEEIoE.

EVAN GEORGEFF, OF PORTLAND, OREGON.

SASH-IBALANCING MECHANISM.

T0 all whom it may concern Be it known that I, EVAN GEORGEFF, a subjectof the King of Bulgaria, residing at Portland, in the county ofMultnomah and State of Oregon, have invented certain new and usefulImprovements in Sash-Balancing Mechanism, of which the following is aspecification.

My invention relates to means for balancing and locking window sashes,and is an improvement on a device of this character for which LettersPatent were ranted to me, of the United States, on ept. 13th, 1910, NO.970,036.

The object of my invention is to provide a device of the type mentionedof simple and durable construction, by means of which any sliding sashwindow can be opened or closed at will from the inside, and then lockedin osition, so that a erson from the outside is unable to disturb t eadjustment of the window sashes.

To this end my invention consists in the combinations and arrangementsclearly set forth in the followin description.

In the appended rawing forming part of this application Figure 1 is asectional elevation of a sash balancing device embodying my invention,Fig. 2 is a sectional rear end elevation in agreement with Fig. 1, Fig.3 illustrates in sectional side elevation the actuating mechanism of mydevice, Fig. 4 is a front view of the mechanism shown in Fig. 3, andFig. 5 shows a modified form of sash lockingr mechanism.

To the window frame a is secured a casing b, in which is rotatably hunga spindle d, and to said spindle is rigidly secured a gear wheel c. Saidgear wheel is constantly in mesh with a rackbar e, secured to the edgeof window sash f. A suitable spring g, suspended between spindle d andcasing serves to counterbalance the weight of sash f.

I wish it understood that I prefer to provide sets of balancing deviceson both sides of the window in order to perfectly balance both the upperand lower sashes controlled by said devices, but as the construction ofmy device in all cases remains the same, I confine myself to thedescription of one device in connection with the lower sash A rock-shafth is journaled in casing b in vertical alinement with spindle al, and tothis shaft is rigidly secured a pawl z'. The latter Specification ofLetters Patent.

Application led July 28, 1811.

Patented Apr. 16, 1912.

Serial No. 641,153.

is made with two symmetrical arms disposed on opposite sides of therock-shaft and adapted to engage the teeth of gear-Wheel c. Integralwith pawl z' is a centrally disposed detent l, which through the mediumof a spring mechanism m controls the action of said pawl.

To fully understand the operation of my device sash f is, in the firstinstance, considered to be in its highest position. On lowering the sashgearwheel c is caused to rotate in the direction of arrow n, thuswinding spring g. When the sash has been lowered as far as desired, pawlz' is caused to oscillate until arm lc engages gear-wheel c as shown indotted outline 1n Fig. 1, thereby locking the sash against upwardmotion. It is thus possible to leave the sash partly open, withoutdanger of an intruder raising the sash from the outside, as themechanism controlling the movement of rock-shaft 7L, as will bedescribed later, is mounted on the inside of the window frame. If on theother hand the operator desires to raise the sash and to lock it againstdownward motion, pawl z' is oscillated in the oposite direction causinarm to enffaee l b D gear-Wheel c.

Rock-shaft h is of a tubular construction and provided with alongitudinal slot o. A key p, mounted on the inside facing strip g ofwindow frame a, is adapted to engage rock-shaft h, and in thus engagingrib r of said key lodges in slot o of said shaft. Key p is rotatab yfixed in escutcheon plate s, and is provided with a circular handle orknob t, to the base of which is secured a ointer u in alinement with ribr of the key. l aid escutcheon plate is provided with a scale, see Fig.4, with which pointer u is adapted to register. If for instance it isdesired to raise the closed sash a few inches for ventilation, pointer uis first brought to register with the central graduation marked Free;Jwhereby pawl i is thrown clear of gear c. The sash is then raised andpointer u, in order to lock the sash against further raising motion, isturned until it registers with the graduation marked Down.

Attention is called to the peculiar shape of spring m, by means of whichthe operator is able to lock pawl z' in any one of its three positions.When in its central position, the pavvl, as already shown, is cntirelyclear of the geanwheel, and the sash may be raised or loweredunobstructed, which is a great convenience for instance in cleaning thewindow.

If handle t were oblong as it is usually found in devices of this type,it would be possible for an outside intruder, if the sash were heldraised a few inches, to sli a stick through the opening and turn saihandle sutliciently to further raise the sash, but with the circularknob t shown this is not possible. On the other hand the pointer u andthe graduations on the escutcheon plate are necessary in connection withthe circular knob in order to enable the operator to quickly andaccurately manipulate the mechanism.

In Figs. 4 and 5 I illustrate an additional and important feature of myinvention. Pawl z' is here replaced by a compound pawl fv, comprisingarm w integral with which is detent m. Arm y on the other hand isrotatably hung on shaft h and held in its normal position by the actionof a light spring 3, which forces shoulder 2 of the arm againstprojection e of the detent. A dog 4 is mounted to rotate with a stud 5,and the stud extends inward through the window frame and escutcheonplate s, its inner end being provided with a knob 6. The operator raisesthe sash and oscillates arm w, thereby causing said arm w to engage gearc and the sash is locked against further raising, but it is still freeto be lowered. To lock the sash so that it cannot be lowered either, dog4 is, by turning knob 6, caused to engage and depress arm y, whichreadily yields against the light pressure of spring 3, and engagesgear-wheel c.

Having thus described my invention, I claim:

l. In a device of the character described in combination with springcontrolled balancing means, a gear wheel, a hand operated pawl mechanismcoperating with said gearwheel, a detent on said pawl mechanism, atri-grooved spring coperating with said detent to retain said pawlmechanism in any position required to operate the sash.

2. In a device of the character described in combination with springcontrollel balancing means, a gear wheel, a hand operated pawl mechanismcooperating with said gearwheel, a detent on said pawl mechanism, atri-grooved spring cooperating with said detent to retain said pawlmechanism in any position required to operate the sash, and a handoperated dog for effecting the interlocking of said pawl mechanism withsaid gear Wheel.

3. In a device of the character described in combination, a casing, agear wheel rotatably hung in said casing and engaging a rack bar on thesliding sash, a sash balancing spring between said gear and said casing,a rock shaft journaled in said casing, a lock pawl rigid on said rockshaft, a lock pawl journaled on said rock shaft, cooperating springactuated means for holding said pawls interlocked, means for oscillatingsaid rock shaft to cause either of said pawls to engage the gear wheel,or to totally disengage said pawl mechanism from said gear wheel, meansfor yieldingly retaining said lock pawl in any one of its threepositions, a circular handle attached to said rock shaft, a pointer, ascale on the Window frame coperating with said pointer to indicate thesetting of the pawl mechanism, and a hand operated dog for eiiecting theinterlocking of said pawl mechanism with said gear wheel.

In testimony whereof I alix my signature in presence of two witnesses.

EVAN GEORGEFF.

Witnesses:

K. F. DOUGHTY, C. C. ABBo'rr.

Copies o! this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

